星系壁纸
by X-ray: NASA/CXC/SAO/J.Drake et al., Optical: Univ. of Hertfordshire/INT/IPHAS, Infrared: NASA/JPL-Caltech
NASA Image Library · 公有领域（Public Domain）
关于这张图
The Milky Way and other galaxies in the universe harbor many young star clusters and associations that each contain hundreds to thousands of hot, massive, young stars known as O and B stars.
